High-speed-sync flash possible on a slave speedlight?

Home Forums Photography Q&A High-speed-sync flash possible on a slave speedlight?

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    James Staddon

    High-speed-sync flash is a feature on both the 430EX and 580EXii speedlights. However, I seem to only be able to get high-speed-sync flash to work when it’s sitting in the hotshoe. As soon as the 430EX or 580EXii are triggered remotely as slaves, high-speed-sync longer seems to be an option. I’ve read the manuals and scoured the Internet, but I can’t find anything that confirms this. Can anyone confirm this for me?

    To explain the problem from a more practical perspective, with the speedlight sitting in the hotshoe with high-speed-sync on (on a Canon 7D II in Manual mode with shutter speed set to 1/800) the speedlight fires and the photo is taken at 1/800. As soon as I take the speedlight off the hotshoe, however, and set it to work as a slave, high-speed-sync is no longer an option, and (on the Canon 7D II in Manual mode with the shutter speed set to 1/800, with the popup flash set as the trigger for the slave) the sleedlight fires and the photo is taken at 1/250, the default max flash sync speed.

    So I’d like to know two things:
    1. Can anyone confirm that off-camera high-speed-sync is not generally possible (without a more special trigger)?
    2. What special trigger should I buy that would allow the off-camera high-speed-sync to work on either of these two speedlights (preferably the 430EX)?

    Ezra Morley

    Wow, that’s the kind of question that I like to sleuth for. 🙂
    For starters, here’s a thread that might shed some light on the subject: https://photo.stackexchange.com/questions/50180/high-speed-sync-flash-with-430ex-ii-off-camera. That thread gives a couple of options:

    Another solution I’ve seen is to buy a cheap (used?) Canon 90EX flash to use as a wireless master. This forum post indicates specifically that “the Speedlite 90EX itself cannot fire with high-speed sync, but as a master unit, it can signal compatible slave units to do so.”

    • This reply was modified 2 weeks, 5 days ago by Ezra Morley.
    James Staddon

    Thank you @buddingphotographer! I think I’ll just use an ND filter for now. That was a good idea.

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